A dog and pony show
Definition 1 of 2
Pro Tip 1/3Skepticism Warranted
Use this phrase to convey doubt about the true value or intention of something flashy or dramatic. 
The elaborate presentation was just a dog and pony show hiding their lack of real results.
Pro Tip 2/3Critically Dismissive
The phrase often implies you think the event is intentionally deceptive or distracting. 
That political rally was a total dog and pony show—no real issues were addressed.
Pro Tip 3/3Negative Connotation
It usually has a negative connotation; don't use it when you mean to compliment. 
The startup's pitch felt like a dog and pony show, all hype and no substance.